Encapsulation of folic acid (vitamin B9) into sporopollenin microcapsules: Physico-chemical characterisation, in vitro controlled release and photoprotection study

Mohammed, Al-Shymaa Y; Dyab, Amro K. F.; Taha, Fouad; El‐Mageed, Ahmed I. A. Abd

doi:10.1016/j.msec.2021.112271

Cited by 29 publications

(26 citation statements)

References 94 publications

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“…In our previous study, we demonstrated (using SEM analysis of broken drug-loaded LCS microcapsules after using the same protocol used here) that both the interior core and the LCS surfaces were free of any drug accumulations, indicating the protocol's efficacy in extracting the drug. 62 Furthermore, our earlier optical microscopic pictures of the drug-loaded LCS following each cycle of the sonication process depicted an increase in sporopollenin ornament fragmentation over the four-cycle process, 62 corroborating the current findings. Sonication of numerous pollen species culminated in fractured pollens, which aided in obtaining a high-quality FTIR spectrum.…”

Section: Resultssupporting

confidence: 82%

Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies

et al. 2022

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Section: Resultssupporting

confidence: 82%

Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies

et al. 2022

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“…The peak at around 1595 cm −1 was attributed to the stretching of the imidazole skeleton, the same as 5B−SiO 2 −NH 2 −3−I in Figure 1b, indicating the successful imidazolium ILs synthesis [19] . Besides, in Figure 1b 5B−SiO 2 −NH 2 −3−I showed moderately strong adsorption peak at 1510 cm −1 , which was considered as −NH 2 [23] . While in 5B−SiO 2 −OH−3−I catalyst, this peak almost vanished, also suggesting the conversion of −NH 2 to imidazolium ILs.…”

Section: Resultsmentioning

confidence: 87%

In‐situ Synthesis of Ionic Liquids on B‐doped Mesoporous SiO₂ Catalyst for Epoxide‐CO₂ Cycloaddition

Chen

Huang

et al. 2022

Asian J Org Chem

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A series of functionalized ionic liquids (ILs) immobilized on B‐doped mesoporous SiO2 catalysts were fabricated for effectively converting CO2 into cyclic carbonates under metal‐absent and cocatalyst‐free conditions. Functionalized imidazolium ILs were in‐situ synthesized by Debus‐Rdziszewski imidazole reaction. Among the prepared catalysts, 5B−SiO2−NH2−3−I catalyst owing to the synergistic effects of nucleophile, Lewis acid‐base and hydroxyl hydrogen bond donors in the catalyst, presented the better catalytic activity for propylene epoxide to the product of propylene carbonate with 99% yield and selectivity at 110 °C and 2 MPa CO2. The catalyst also displayed moderate yield for various mono‐substituent epoxides. Besides, the gradual decline in the product yield during consecutive runs could be easily refreshed by aqueous acidic solution washing.

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“…Finally, the band located at 1050 cm –1 is attributed to the C–O–C bond stretching in carbohydrates, and it completely disappeared after the orthophosphoric acid treatment. This result suggests that the orthophosphoric acid treatment impacted the carbohydrate backbone and removed the cellulosic material inside the sporopollenin. , …”

Section: Resultsmentioning

confidence: 90%

“…The weak vibration at 3010 cm –1 corresponds to the stretching on the C–H bonds of the aliphatic chains caused by unsaturated fatty acid esters from the lipids. When the acidolysis time increased, the intensity of the vibration diminished until it technically disappeared for the 12 and 24 h acidolysis, suggesting the removal of lipds. , The strong vibrations observed at 2925 and 2855 cm –1 are due to asymmetric and symmetric C–H bond stretching in the methylene group associated with carbohydrates. , The intensity of these aliphatic vibrations decreased with acidolysis with orthophosphoric acid after 12 and 24 h. It could be due to the spores suffering structural damage due to the loss of carbohydrates from the sporopollenin; see Figure . Vibrations in 1744 and 1705 cm –1 are attributed to the stretching of the CO bond from the ester and carboxylic acid groups.…”

Section: Resultsmentioning

confidence: 96%

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Biobased Spore Microcapsules for Asphalt Self-Healing

Alpizar-Reyes

Concha

Martín‐Martínez

et al. 2022

ACS Appl. Mater. Interfaces

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Asphalt pavements and bituminous composites are majorly damaged by bitumen aging and fatigue cracking by traffic load. To add, maintenance and reparation of asphalt pavements is expensive and also releases significant amounts of greenhouse gases. These issues can be mitigated by promoting asphalt self-healing mechanisms with encapsulated rejuvenators. The ability of the required microcapsules to be resilient against high temperatures, oxidation, and mechanical stress is essential to promote such self-healing behavior without compromising the field performance of the asphalt pavement. This work proposes, for the first time, the use of extremely resistant biobased spores for the encapsulation of recycled oil-based rejuvenators to produce more resilient self-healing pavements. Spore encapsulants were obtained from natural spores (Lycopodium clavatum) by applying different chemical treatments, which enabled the selection of the best morphologically intact and clean spore encapsulant. The physical, morphological, and physicochemical changes were examined using fluorescence images, ATR-FTIR, SEM, size distribution, XRD, TGA and DSC analyses. Sunflower oil was used as the encapsulated rejuvenator with an optimal sol colloidal mixture for sporopollenin–oil of 1:5 (gram-to-gram). Vacuum, passive, and centrifugal encapsulation techniques were tested for loading the rejuvenator inside the clean spores and for selecting the best encapsulation technology. The encapsulation efficiency and the profiles of the accelerated release of the rejuvenator from the loaded spores over time were studied, and these processes were visualized with optical and inverted fluorescence microscopy. Vacuum encapsulation was identified as the best loading technique with an encapsulation efficiency of 93.02 ± 3.71%. The rejuvenator was successfully encapsulated into the clean spores, as observed by optical and SEM morphologies. In agreement with the TGA and DSC, the microcapsules were stable up to 204 °C. Finally, a self-healing test was conducted through fluorescence tests to demonstrate how these biobased spore microcapsules completely heal a crack into an aged bitumen sample in 50 min.

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Encapsulation of folic acid (vitamin B9) into sporopollenin microcapsules: Physico-chemical characterisation, in vitro controlled release and photoprotection study

Cited by 29 publications

References 94 publications

Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies

Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies

In‐situ Synthesis of Ionic Liquids on B‐doped Mesoporous SiO₂ Catalyst for Epoxide‐CO₂ Cycloaddition

Biobased Spore Microcapsules for Asphalt Self-Healing

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Encapsulation of folic acid (vitamin B9) into sporopollenin microcapsules: Physico-chemical characterisation, in vitro controlled release and photoprotection study

Cited by 29 publications

References 94 publications

Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies

Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies

In‐situ Synthesis of Ionic Liquids on B‐doped Mesoporous SiO2 Catalyst for Epoxide‐CO2 Cycloaddition

Biobased Spore Microcapsules for Asphalt Self-Healing

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Product

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In‐situ Synthesis of Ionic Liquids on B‐doped Mesoporous SiO₂ Catalyst for Epoxide‐CO₂ Cycloaddition